1900
The 1900 Census was the Twelfth. The Census Bureau provides a list of the 100 largest cities in that year.
| Rank | City | State | Population | Notes |
| 1 | New York | New York | 3,437,202 | This is the first census after the creation of The Five Boroughs. |
| 2 | Chicago | Illinois | 1,698,575 | |
| 3 | Philadelphia | Pennsylvania | 1,293,697 | |
| 4 | St. Louis | Missouri | 575,238 | |
| 5 | Boston | Massachusetts | 560,892 | |
| 6 | Baltimore | Maryland | 508,957 | |
| 7 | Cleveland | Ohio | 381,768 | |
| 8 | Buffalo | New York | 352,387 | Re-appearance in the top 10 (last 1860). |
| 9 | San Francisco | California | 342,782 | Last appearance in the top 10 and before the 1906 earthquake and fire. |
| 10 | Cincinnati | Ohio | 325,902 | Last appearance in the top 10. |
Read more about this topic: Largest Cities In The United States By Population By Decade